La cosa funziona bene con l'MTA, io tempo fa usai postfix:
Vedi man 5 aliases:
|command
Mail is piped into command. Commands that contain
special characters, such as whitespace, should be
enclosed between double quotes. See local(8) for
details of delivery to command.
When the command fails, a limited amount of command
output is mailed back to the sender. The file
/usr/include/sysexits.h defines the expected exit
status codes. For example, use "|exit 67" to simu-
late a "user unknown" error, and "|exit 0" to
implement an expensive black hole.
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